How to bend a stainless pipe

How to bend a stainless pipe at home

How to bend a pipe at home? This question is asked by everyone who has started renovating their private house or apartment and is faced with the need to install plumbing, heating or heated floors, and this requires pipe bending.

Any pipe is a fairly strong structure, and bending it with bare hands is not so easy without certain skills. You can turn to a professional team for help, however, it is not always possible to do this. Then there is only one thing left - to bend an iron pipe with your own hands at home.

Let's look at several effective ways to help do this.

We use simple methods

We use simple methods to bend a pipe at home; they come in three types. The most difficult option is manual bending.

It can be used if you plan to install a complex structure in which curved pipes must be used, however, you do not have special tools for this.

If you have not purchased blanks with the required bending angle, then your only salvation will be to make the parts yourself.

The first thing you need to do is take the pipe from both sides and begin to gradually bend it. The main thing here is not to rush and do everything gradually. You can repeat this action for five or six sets.

In this way, you can bend an aluminum pipe, but this cannot be done with a metal one. This method will help if the pipe is thin-walled and its diameter is from 16 to 20 mm.

If the cut is larger, then this will greatly complicate the task, but even such a pipe is quite possible to give a turn.

In order to bend a metal pipe, using the hot method is suitable. It takes place in several stages:

• first you need to fix the metal piece in a vice;
• warm up the area where a bend should appear in the future;
• When you notice the appearance of scale, you can start bending.

To determine whether the aluminum is hot enough, you can hold a regular sheet of paper to it. If it starts to burn or smoke appears, then you can start working. If we are talking about another metal, it will change its color to red.

Galvanized parts should not be heated in this way, otherwise it may result in damage to the coating and render the coating unusable. As for a square pipe, it is much more difficult to bend it in such a way that creases and deformations do not form.

For this material, it is best to use a powerful blowtorch or burner, and before starting work, you should warm up all sides of the product. This way you can bend the exhaust pipe. Under no circumstances should you bend a stainless pipe in this way; use only cold methods for this.

For example, you can bend stainless steel using a lever pipe bender or a Volnov machine.

Sand and water as fillers

Sand and water as fillers can come to the rescue when it is necessary to bend a pipe. In order to bend a corrugated pipe, aluminum or duralumin piece of large diameter at home, you can use fillers such as water and sand. To do this with sand, you need to do the following:

• pour sand into the structure and cover the ends with plugs;
• fix the part in a vice;
• use a soldering iron or a gas heating pad to warm up the area you will bend;
• After the area has warmed up, bend the structure using a rubber mallet or a mallet made of wood. Tap the surface with gentle, light strokes;
• Once the required bend is achieved, you can remove the plugs and remove the sand.

Thanks to sand, the material will be protected from deformation and you will be able to prevent uneven bending.

As for the principle of working with water, it is very similar to the previous method. Before you begin bending, you need to fill the part with water and install plugs.

If you plan to bend PVC pipe or other similar material, place the pipe in the cold or in a refrigerator and let it freeze. After it freezes, slowly bend the structure to the desired radius.

In the same way, you can change the shape of a metal sheet and turn it into a pipe, only you do not need to use water and sand for this.

Using pipe benders

The use of pipe benders is suitable if you do not use heating and cooling efficiently. You can use a plane-parallel plate; it is a curved piece of wood or metal with a groove. The method is excellent for deforming steel and metal products with a diameter of up to 45 mm.

1. First of all, place the pipe in the clamp on the plane-parallel plate and fix it.
2. Bend and repeat the shape of the workpiece along the groove.
3. When the pipe has acquired the required shape, it can be removed.

This method does not require large expenses. Despite the simplicity and profitability of this method, it also has its disadvantages - the curvature of the workpiece cannot be changed. To get rid of this problem, it is necessary to use plates with a different radius of curvature.

You can also bend the pipe using a metal spring. It will help for modifying parts made of ductile non-ferrous metals. Thanks to the spring you will prevent deformation of the structure. All you have to do is place the spring in the pipe and gradually bend it. Thanks to the spring, the process becomes much easier, because it helps to perform compression and tension, since it takes all the load on itself.

How else can you bend a pipe?

How else can you bend a pipe? If the above methods do not suit you, then you can use other, no less popular methods.

1. To bend a polypropylene pipe, you can use a hair dryer. You will need a template that will have the required angle and the hair dryer itself. First, heat the pipes to a state where it can bend easily, then place it in the template and secure it there. It should remain there until it dries completely.
2. A plastic pipe can be bent using wire. We insert individual wire pieces into the pipe, they should completely fill the space, after which we begin to gradually bend it at a certain angle. After the pipe has acquired the required shape, remove the pieces of wire.
3. To reshape the polyethylene pipe, you can use fiberboard. You will need to cut out a frame from it, then carefully sand it and make a silicone shell using a molding machine. We place the product in the frame and fix it in the frame, after which it is sent to a molding machine, and there the HDPE pipe takes the required shape.

In order to make your work easier, we recommend purchasing a pipe bending machine - a pipe bender. With its help, you can bend any type of pipe at home, including chrome and profile.

Similar materials

Source: http://ooo-asteko.ru/kak-sognut-nerzhaveyuschuyu-trubu-v-domashnih-usloviyah/

How to bend a stainless steel pipe correctly

When installing heating and water supply systems from pipes, it is necessary to make bends and transitions. Round and square profiles can be processed. Depending on the thickness of the pipe walls, profile cross-section, and bend radius, the processing method is selected.

Bent stainless steel pipes

Features of pipe bending

Stainless steel profile bending is carried out in several ways:

• manual;
• mechanical;
• cold.

During the processing process, negative consequences may occur that will adversely affect the pipe structure. Depending on the material from which the profile is made, the internal diameter, as well as the bend radius, the degree of defects differs. Before bending a stainless steel pipe, a processing method is selected.

When bending a profile, you must remember that it is prohibited to heat the metal.

Negative consequences of bending

Disadvantages when processing stainless steel pipes include:

1. Changing the parameters of the external and internal walls of the radius. As a result of the formation of tension in the metal, the outer walls are subject to thinning and the inner walls are compressed.
2.  Significant weakening occurs when the workpiece is ovalized. This phenomenon can have a negative impact when installing a pipeline for moving pulsating liquid or gas.
3. The appearance of folds on the inside is observed as a result of an increase in the thickness of the profile. With such a defect, the internal flow of the substance will encounter increased resistance associated with a decrease in the diameter of the pipe. Folds promote corrosion and the strength of the structure will decrease.

When processing a pipe profile, some methods of protection against damage are used:

• the internal limiter maintains the integrity of the workpiece;
• external stops are able to preserve the external surfaces of the profile.

To prevent defects, it is recommended to use external and internal limiters.

Bending methods

The use of manual or industrial devices depends on the number of workpieces and bending parameters. To bend a stainless pipe, use the following methods:

1. By winding, you can process a workpiece with a cross-section from 1 cm to 4.26 cm, thereby creating a different configuration. To maintain the shape of the profile, limiters consisting of parts are used.
2. Using rolling, parts with a diameter of no more than 15 cm, as well as large wall thicknesses, are bent. Processing is carried out as a result of the roller moving around a static base.
3. In order to give the pipe the shape of a ring or spiral, it is necessary to use the rolling method. The workpiece bends as a result of movement between the rollers.
4. To prevent the formation of defects when bending a profile, a stretching method is used. The ends of the pipe are secured, stretched and bent.
5. To perform the support method, a pair of racks is used, and a pipe is laid on them. Using a jack and a template, the pipe is shaped. Maximum diameter up to 35.1 cm.
6. As a result of excessive water pressure being pumped into the part, stresses can appear that make the stainless steel ductile. The shape is also given manually using a template.
7. The workpiece is pushed through a fixed and movable roller. When changing the distances between the rollers, the bending radius changes.

Devices such as springs, metal cables, as well as water or oil can be used as internal limiters. Emulsions can be used as lubricants to prevent corrosion.

Pipe bending using a machine

Principles of bending at home

To bend a pipe without a pipe bender at home, you must do the following:

1. A spring is pre-made from wire with a cross-section of no more than 4 mm. It should pass freely inside the workpiece.
2. A wire is tied to one end of the spring in order to later remove it from the profile. The part is placed in the pipe directly into the area to be processed.
3. The workpiece is bent using a prepared matrix or template. To increase the force, use an extension at the opposite end.
4. After bending, the spring is removed from the profile.

To prevent profile defects, you can use water or sand. The material is poured or poured inside the pipe and sealed hermetically on both sides. It is recommended to freeze the workpiece and turn the water into ice. The bending is carried out manually, then the ice will melt, leaving the liquid to be drained.

Compliance with safety and technology requirements allows you to obtain the necessary shapes of the workpiece without additional devices and preparation.
Bend the pipe with your own hands

How to properly bend a stainless steel pipe Link to main publication

Source: https://metalloy.ru/obrabotka/sgibanie/truby-iz-nerzhavejki

How to bend a stainless steel pipe at home

When manufacturing building structures or installing water supply and heating systems, sometimes there is a need to bend pipes. Moreover, the required bending radius can be obtained from blanks with a profile or circular cross-section. There are many ways to bend tubular elements.

The choice of one method or another depends on the wall thickness, pipe cross-section, material, bending radius, and the availability of special tools. In our article we will tell you how to correctly bend a stainless steel pipe so as not to damage it.

At the same time, we will list the main industrial bending methods, as well as methods that can be used at home.

Protection against ovalization

The main methods of cold bending a galvanized pipe involve measures that allow the workpiece to be bent while preserving the shape of its cross-section as much as possible. Typically one of two methods is used for this:

• The use of measures to preserve the shape of the section from the inside (use of an internal limiter).
• Using an external stop to prevent expansion of the side walls.

Important: a mandrel - a calibrating plug or fillers such as fine sifted sand or frozen water - can act as an internal limiter. Low-melting metals, rubber and resins are also used as fillers.

Rigid materials as fillers retain their shape better, so they are used more often. But thanks to the use of elastic fillers, less stretching of the outer surface of the bend occurs.

Advice: in order to preserve the cross-sectional configuration as much as possible and more accurately bend the workpiece, it is better to use both an external and an internal stop at once.

Industrial cold bending methods

Depending on the diameter of the element and the volume of work, hand tools (pipe benders) or devices with an electromechanical drive can be used.

Basic industrial cold bending methods:

• Winding method. This technique allows you to bend a pipe with a cross-section in the range of 1.0-4.26 cm in different planes. To maintain the shape of the section, composite or rod mandrels are used - calibrating plugs.
• With a run-in. This method is suitable for bending tubular elements with a diameter of no more than 15 cm. In this case, the wall thickness should be impressive. The essence of the method: a rolling roller moves around a static bending roller of a given size. He presses the pipe and bends it.
• Rolling. This method allows you to bend the workpiece in a spiral or into a ring. On rollers, the element is moved by rollers and acquires the curvature specified by the position of the rollers.
• By dragging. The method is suitable for bending thin-walled, seamless products. For bending, a template is made from a tubular element of larger diameter. The template is then threaded through the die and secured with a clamp. Due to the rotation of the template, the workpiece is pulled through the die and bent.
• By stretching. This technique allows you to minimize the risk of metal deformation. To do this, the workpiece is fixed at the edges, stretched and bent simultaneously through the use of a bending template.
• On supports. Typically, two supports are used on which the workpiece is laid. As the supports bend, they rotate around their axis. The template is connected to the jack rod so that the force is applied in the center of the workpiece. The method is suitable for bending tubular products with a diameter of no more than 35.1 cm. The equipment allows bending to be performed directly on the construction site.
• With hydrostatic pressure inside. To do this, liquid is injected into the tubular element. Plugs are installed at the ends. Due to the stresses that arise, the metal reaches an almost plastic state. Then a template is brought to the bending point and the workpiece is bent.
• With pushing. The method is suitable for bending elements with a diameter within three inches. The workpiece is pushed through a fixed and movable die. Due to the displacement of the matrices relative to each other, the curvature of the bend can be adjusted. Using this technique, one workpiece can be bent several times in different planes.

As for the use of mandrels, the simplest plug for pipes with a cross-section of no more than 3.2 cm can be a steel cable. One end of this cable is fixed in the handle. The other end is connected to the wire to pull into the lumen. In this case, the diameter of the calibrating plug should be slightly smaller than the cross-section of the tubular product - approximately 0.1-0.5 mm.

When using calibration plugs, unwanted scratches and nicks may occur on the inner surface of the workpiece. This usually happens when bending stainless steel products. To protect against such undesirable consequences, you need to choose the right material for making the cork, as well as use lubricant and thoroughly clean the surface.

Important: for lubrication you can use soapy anti-corrosion emulsion or machine oil. It is better to lubricate the entire element by immersing it in a bath of substance. To lubricate a bend that is far removed from the ends of the workpiece, use a mandrel with holes through which lubricant can be supplied.

Manual bending methods

To bend the workpiece at home, you can use a manual pipe bender. Most often, a crossbow-type tool is used, which bends the element, squeezing it out at the point of bending.

Attention: when bending at home, you should also try to avoid the undesirable consequences of this procedure.

In order to prevent changes in the cross-sectional configuration of the tubular element, means are used to counteract deformations from the inside. Typically, clean sand sifted through a fine sieve is used for these purposes. The procedure is performed in the following sequence:

1. A plug is driven into one side of the workpiece, for example, a wooden chopper.
2. Prepared sand is poured into the remaining hole.
3. This hole is also tightly closed with a plug.
4. After this, the pipe is bent around a blank of a suitable size.
5. After this, the plugs are removed and the sand is poured out.

Instead of sand, frozen water can be used as a limiter if the procedure is performed in winter. In this case, water is poured into the workpiece cavity, which is closed on one side. Then the second hole is also plugged. Bending around the blank is performed after the water freezes. After removing the plugs, the ice will melt on its own and the water can be poured out of the pipe.

Important: for bending at home, only galvanized pipes with a diameter of no more than 4 cm and a wall thickness of no more than 3 mm are suitable. Otherwise, it is better to use only professional methods.

You can also bend a galvanized pipe yourself using a spring. To do this, do the following:

1. A spring is specially made from wire with a diameter of 1-4 mm. In this case, it must fit freely inside the tubular element.
2. We tie a wire to one end of the spring and fix it on the edge of the workpiece, so that later the spring can be removed without any problems. We place the spring product itself in the place of the pipe where it is planned to bend.
3. We bend the workpiece around a steel blank or using a manual pipe bender.
4. The spring can now be removed.

This technique is ideal for bending profile pipes. Just keep in mind that the spring must have the configuration of a bendable element.

Another method is performed using a bundle of wire. Each wire is individually inserted into the workpiece so that the entire bundle tightly fills the tubular element. After bending, the wire is removed in the same way, individually, from the pipe cavity.

Source: https://vodakanazer.ru/truboprovod/kak-sognut-nerzhavejku.html

How to bend a stainless pipe?

When manufacturing building structures or installing water supply and heating systems, sometimes there is a need to bend pipes. Moreover, the required bending radius can be obtained from blanks with a profile or circular cross-section. There are many ways to bend tubular elements.

The choice of one method or another depends on the wall thickness, pipe cross-section, material, bending radius, and the availability of special tools. In our article we will tell you how to correctly bend a stainless steel pipe so as not to damage it.

At the same time, we will list the main industrial bending methods, as well as methods that can be used at home.

How to bend a pipe at home without a pipe bender from different materials: methods

When installing water supply and heating systems, during their repair there is a need to bend pipes. A pipe bender is used to bend metal products of various sections. Very often, when performing installation work at the dacha or at home with your own hands, you do not have the necessary tools at hand, and it is not always possible to purchase workpieces with the required bending angle. Let's look at how to bend a pipe at home without a pipe bender.

Methods for bending pipes at home

There are many methods for bending rolled metal. The choice of method depends on the material of the part and its diameter. The most difficult thing to bend is thick-walled metal blanks. Let us dwell in more detail on the most effective methods for steel and aluminum structures.

Application of the hot method

A blowtorch, a hair dryer turned on at maximum heating temperature, or a gas burner are suitable for heating metal. Sand is used as a filler. It prevents rupture of the walls during bending, the appearance of dents and bulging of the metal. To prevent the filler from spilling out, it is recommended to install temporary plugs at the ends.

Important! It is necessary to monitor the glow temperature; overheating can cause the metal to melt. The method is suitable for pipes with a cross-section over 10 cm.

Let's look at how to bend a pipe at home without an aluminum pipe bender. A sheet of paper is brought to the heated surface. If it ignites, heating should be stopped. An indicator of sufficient heating on steel structures is redness to the state of scale. It should be remembered that the metal heats up along its entire length, so the work must be done with rubber gloves.

We use fillers - sand and water

The cavities are filled with water without impurities. Plugs are attached to the ends, then frozen in the freezer or in the cold. Bending is carried out after heating with a gas burner. The procedure cannot be used for products with galvanized coating, otherwise it will be damaged.

This option is suitable for products with a large cross-section or with a square configuration. If you need to bend it at a slight angle, it is better to use sand as a filler. After thorough heating over the entire surface, the part is bent by tapping with a mallet. Galvanized structures are bent without heating.

Important! When filling a cavity with loose filler, it must be compacted so that the internal space is filled without voids. When closing the plug, a reserve is left so that it is easier to remove at the end of the procedure.

Applying templates

If deflection is necessary in several planes or at different radii, a template is used for verification. It is made from wire. Self-tapping screws can be used as a drawing. They are used for curved bends. Self-tapping screws are screwed into a rigid base, giving the desired configuration.

Bending is performed gradually, applying the product to the template for verification. The check sometimes has to be performed multiple times. When heating the surface, the minimum permissible bending size should be taken into account. It is calculated taking into account the section of the part. The smallest bend size is 3 diameters. The length of the heated section depends on the bending radius:

It is recommended to mark the deflection area on the surface with chalk. When heating, areas should be monitored for the quality of heating. If the temperature is insufficient, folds occur during deflection. The optimal temperature for heating metal parts is the appearance of scale. If the surface is overheated, it is carefully cooled with water.

Rolls

Many builders are interested in how to bend a pipe at home without a pipe bender using improvised means. Parts with a diameter of up to 10 mm are bent using rollers without heating. The product is firmly fixed in a vice. When bending, the emphasis is placed on a vice, while simultaneously pressing with a roller. For workpieces with a cross-section of 40 mm , heating is required; bending them using rollers is labor-intensive.

Rolls are also used in a home-made lever pipe bender. The workpiece moves along two rollers located horizontally, and a bend is performed using a central roller. The device is suitable for arched deflection. The bend is uniform and has a large radius.

Springs

The method has proven itself well for parts with a square cross-section, but it is also suitable for pipes of other configurations. A spring of the same shape as the profile itself is required.

The spring mechanism can be made of solid steel wire. The diameter of the rod depends on the wall thickness. The spring is selected in accordance with the cross-section of the part; it can be moved in and out freely. Before bending, the metal is heated, then bent, held with pliers.

Important! You can adjust the deflection radius using a blank.

Simple ways to bend pipes

The bending method with heating is inappropriate for workpieces made of stainless steel, copper, metal-plastic and polypropylene.

Profile

Profile metal products – products with a square, oval or rectangular configuration. It is very difficult to bend them without violating the technical parameters. The best option is welding with preliminary cutting of the walls with a grinder in several places on the bend. First, cuts are made, the part is bent to the desired radius, then the seams are welded. Parts of small diameter can be soldered with a special soldering iron.

Stainless or steel

Stainless steel products cannot be bent by heating. To reduce the likelihood of deformation, various fillers are used: fine-grained sand, frozen water or calibrating plug. Rigid fillers help preserve the shape of the workpiece, elastic fillers allow less stretching of the outer wall. To obtain a uniform bend, limiters are installed both inside and outside the part.

Important! To avoid notches and defects from the calibration plug, use a lubricant: machine oil or soapy anti-corrosion emulsion.

Copper and aluminum

Aluminum and copper are quite soft. Bending can be done using cold or heated methods. Suitable fillers include sand, water, spring or rosin. The hot method is best suited for workpieces with a small diameter.

Metal-plastic

Metal-plastic blanks are bent without heating by hand, just apply some effort. Care must be taken to ensure that no kinks are formed. The permissible value is 15⁰ for every 2 cm.

The products are easily bent using wire, which is inserted into both cavities, filling the cavity evenly. Hot method is allowed. The workpiece is heated with a gas burner or a hair dryer, gradually bending it. The heating temperature is controlled with a paper sheet. Warming up should be continued until the sheet begins to smoke.

Polypropylene

It is recommended to bend polypropylene parts only if absolutely necessary. The surface is heated with a construction hairdryer to a temperature of 150⁰C, and bent by hand with gloves on without any improvised means. Using this method, you can bend workpieces with a radius equal to 8 part diameters.

Tips from experts on bending different pipes

Important! When bending, a thick wall should be located on the outside, a thinner wall should be located on the bend.

When choosing a bending method, you should pay attention to the material of the part, its diameter and the required bending radius. Not all materials allow the procedure to be performed by heating. It is recommended to practice on unnecessary leftovers first. It should be remembered that it is impossible to obtain a perfect bend using improvised means. For thick-walled products, it is better to take a pipe bender.

Source: https://prosto-instrumenty.ru/kak-sognut-trubu-v-domashnix-usloviyax-bez-trubogiba/

How to bend a metal pipe?

This problem can be encountered by anyone who independently carries out plumbing work using various types of pipes.

If you are not a specialist in this field, then you, of course, do not have special tools and professional equipment to carry out such work.

Next we will talk about different ways to bend a pipe at home without a pipe bender, depending on the material from which they are made.

1. When bent, such pipes may decrease in diameter or even break. The simplest and most effective way to avoid deformation or breakage of our product at home: fill the pipe to capacity with dry, finely sifted sand and install plugs at its ends. At home, the easiest way is to drive in wooden choppers, but only in such a way that you can easily pull them out later, avoiding deformation of the pipe itself.

Now the pipe can be safely bent. If the metal or alloy is soft, then this procedure is easy to do with your own hands, or you can use, for example, another pipe of larger diameter fixed or dug into the ground, using the lever method, we make a bend. In winter, instead of sand, you can use plain water: pour; waiting for it to freeze; bend and heat the pipe, turning the ice back into water.

2. If we are dealing with aluminum or steel pipes, then we will need a gas burner or blowtorch. Before starting work, fill the tube with sand (as described above) and securely fasten one end (for example, in a vice). We evenly heat the area of ​​the future bend.

An indicator of sufficient heating of a steel pipe will be its bright red color, and we bring a piece of paper to the place where the aluminum pipe is heated, it should smoke or catch fire. We put on gloves to avoid burns and begin to bend slowly.

REMEMBER! Galvanized pipes cannot be heated for bending.

3. Square profile pipes with a small cross-section can be bent without heating, only with the obligatory filling of sand, or pouring water in winter. In this case, you will additionally need a rubber mallet. We place the ends of such a pipe on two supports and use a mallet to slowly bend the product to the desired shape. If the bending angle is too large, the square-shaped steel pipe can be heated at the bending point.

We have a profile pipe. How to bend a pipe without a pipe bender if you want to preserve its shape? For this we need a strong spring. We insert the spring inside our pipe at the bend, having first tied it securely with wire so that we can then easily pull it back out. We bend our product.

How to bend a metal-plastic pipe?

We will need a lot of bends in the metal-plastic pipe when installing heated floors. Such bends will help to more effectively use the heat-conducting surface of our product.

1. The easiest way is to smoothly bend such a pipe with your hands. It should be taken into account that the bend should be within 15 degrees for every 1.5 - 2 cm. In this way, we can make all the bends we need for installing a heated floor.

2. There is another way. For it we need small pieces of wire, which we pour inside the product until it is completely filled. The wire will give us the opportunity to make smoother bends.

3. What if you can’t make an accurate and smooth bend without a pipe bender? To do this, we will need to install a plug at one end of the pipe, maybe a wooden cap, and fill it with dry, fine sand to the edges of the pipe.

We also place a plug on the other end of the pipe. We securely fasten one end of the product and heat the bend with a blowtorch. We bring a piece of paper to the place of heating; if it smolders, it means that the heating is sufficient.

We take gloves and make a bend of the desired shape, remove the plugs, pour out the sand.

How to bend a polypropylene pipe?

In general, manufacturers of polypropylene pipes do not recommend bending their products at home, but it can still be done. There are two such methods.

1. For the first method, we need to preheat our pipe using a hair dryer to a temperature of about 150 degrees Celsius and, using gloves, bend the product to the desired angle. In this case, one condition must be strictly observed: the thickened wall of the pipe must always be placed on the outside of the curved corner. After the pipe has cooled, inspect the bend in the pipe. There should be no dents or cracks.

2. In the second way, you can bend a polypropylene pipe cold, but the bending radius should not exceed 8 diameters of the pipe itself.

How to bend a plastic pipe?

To work with plastic you will need to do the following operations:

1. Make a special frame from the fiberboard in order to give the plastic blank the required shape;
2. Sand this frame with fine sandpaper;
3. Next, use a special silicone molding machine to make a suitable shell for the plastic blank; it is needed specifically for fastening the pipe in our frame, including it will not allow scratches, chips and various dents to appear on the surface of the plastic;
4. Install the plastic pipe into the manufactured shell;
5. Fix the part well in the frame, then place all the elements on the molding machine;
6. As soon as the plastic begins to soften when heated, it will gradually begin to settle on the frame, as a result of which it will give the workpiece the necessary shape;
7. And the last thing you should do is wait about ten to fifteen minutes, remove the plastic pipe from the frame and wait until it cools completely.

In our article, we looked at many ways to bend a pipe at home without a pipe bender.

We can do all of the above methods with our own hands, without having practically any special devices or tools.

Bent pipes may also be required in other cases: to make a coil for a moonshine still, to connect a washing machine without special factory-made curved pipes for power supply and drainage, and so on.

Pipe benders for bending pipes

It would be wrong not to remind you about special tools for bending pipes. In general, qualified specialists mainly use special pipe benders when working with pipes.

According to the bending method, such tools are of the following types:

• Crossbow - (a certain shape is used, which is needed for pipes of a special diameter);
• Spring - (based on a steel spring, which helps bend plastic pipes independently without deformation);
• Segmental - (pipe bending is carried out using a special segment, it is capable of pulling the workpiece around itself);
• Mandrel - (as a rule, they allow you to bend pipes with thin walls and small radii).

According to the type of drive, as a rule, they are:

• Manual - (used in most cases for bending pipes of small diameter, for example from stainless steel, thin polymers, and other non-ferrous alloys);
• Hydraulic - (industrial, make it possible to shape pipes up to three inches in diameter);
• Electromechanical - (used for various pipe diameters, they allow you to achieve high accuracy of the required bending radius of the product, as well as angle accuracy).

For work at home, a regular manual pipe bender is perfect. It will be sufficient for bending stainless, aluminum, brass, copper thin-walled pipes, including those coated with plastic, that is, those that do not exceed a diameter of 25 millimeters.

I hope that this article will make it much easier for you to carry out renovations in your own home or apartment.

Source: https://rem-serv.com/kak-razognut-trubu-metallicheskuyu/

How to bend a thin-walled stainless steel pipe

Both in production and in everyday life, one of the most commonly used elements for the manufacture of various metal structures is a pipe. The most durable, reliable and durable pipe is made of stainless steel.

Specialized industrial enterprises are engaged in the production of stainless steel pipes. But you can purchase such a pipeline even in the most unexpected place. For example, you can buy a stainless pipe directly from the manufacturer, at a specialized sales point, or even at a metal warehouse.

There is another very popular way, the easiest, to use the Internet, find the supplier’s website and place an order.

What are the dangers of bending a pipe?

Making a structure using stainless steel pipes is a labor-intensive and difficult process that requires certain experience, knowledge, and, of course, the availability of special tools.

During the work, you may encounter the need to bend the pipe.

Before you start bending a pipe, especially when it comes to a thin-walled pipe, you need to remember that this is, first of all, a violation of its integrity, which is fraught with consequences, such as the loss of the original properties and qualities of the product.

Manual bending methods

Of course, bending a pipe yourself at home is more difficult than at an industrial enterprise, where special equipment is used for this, but it is possible.

Here are a few methods that will help you achieve the desired result:

1. A tool such as a manual pipe bender will help you bend a thin-walled stainless steel pipe. Its design reminds many of a crossbow and it works almost the same. You need to insert the pipe, perform a few simple movements with your hands, and the pipe will be bent.
2. The second method involves making a special spring from wire. To make the device you will need a wire with a diameter of 4 mm. A pipe is pulled into it, the spring begins to bend, as a result of which the pipe also bends.
3. You can also bend a thin-walled stainless steel pipe using a conventional torch. To do this, the pipe is fixed in a vice. The burner must be directed to the place on the pipe where you want to bend it. The burner heats up the pipe section. You need to carefully monitor the color change of the area that is being heated; as soon as it has acquired a bright red color, you need to turn off the burner and, armed with a hammer, hit this area, which will lead to the desired bend.

Source: http://postroyka.org/kak-sognut-tonkostennuyu-trubu-iz-nerzhaveyki/

How to bend a stainless steel pipe

During construction, repair and installation work, pipes are used for laying sewers, gas pipelines, water supply, ventilation, sewerage, etc. Depending on the location of operation, pipes made of different materials, different thicknesses, diameters and lengths are used. However, it is not always possible to use an elbow or adapters.

In such cases, you have to bend the pipe, as a result it can be damaged or even ruined. Since a material such as stainless steel has sufficient strength, has a long service life and is not affected by moisture, it is often used during installation work.

Therefore, in this article we will look at how to bend a stainless steel pipe.

The process of bending metal products can be divided into two types. Temperature, when the workpiece or part of it is heated or cooled with subsequent bending. Mechanical, when the workpiece is acted upon with a certain force, using special devices or bending it manually. It is worth noting that stainless steel is a relatively technologically advanced material and there are usually no difficulties during operation.

Stainless steel pipes should not be bent with pre-heating (such as a gas torch or blowtorch).

Bend as a negative factor

When bending, the pipe is deformed

Pipe bending is detrimental to performance. There are various disadvantages depending on the material, bending angle, bending device and method, internal diameter and thickness of the material. Negative consequences include:

• change in bending radius during operation under the influence of thermal expansion or contraction and mechanical action, resulting in a springing effect;
• reducing the thickness of the outer wall at the bend;
• the appearance of sharp breaks or folds in the form of an accordion on the inner wall of the bend;
• ovalization - a change in the shape of the pipe and the appearance of an oval-shaped lumen;
• increased exposure to corrosion on the inner and outer walls of the bend.

When a substance passes through the internal cavity of the pipe, special pressure is exerted on the outer wall, therefore, when installing in places where liquids flow at high pressures, it is recommended to use an elbow, thickening or a pipe with thicker walls.

The resulting ovalization also negatively affects the pipes during rapid fluid flow. In such places, there is a narrowing along one axis and expansion along the other, which, in turn, also increases the pressure on the outer wall of the bend.

You also need to take ovalization into account when laying pipes in narrow places, since its width at the bend increases.

Scheme of deformation during pipe bending

There are two ways to prevent ovalization and maintain a round shape during cold bending. First, support the walls from the inside using an internal stop. Second, support the walls both from the inside and outside, using an internal and external stop.

The internal limiter can be sand, rubber, water, resins or fusible materials carefully compacted into the pipe. The main thing is to securely close the pipe holes so that when the pressure increases during bending, the filler does not fall out.

If possible, it is recommended to seal the pipe openings tightly.

When using the second method, the integrity indicators are slightly higher, but this requires special mechanical elements or tanks, which are usually used in the industrial production of pipes. If a more rigid and solid internal filling is used, a more round shape of the lumen will be maintained, so they are used more often. But when using elastic fillers, the outer side is less stretchable.

Bending a stainless steel pipe in a homemade device

In production, when it comes to bending stainless steel pipes, cold bending is usually used due to higher profitability, and in cases where hot bending is necessary, it is often more profitable to simply pour the required shape right away. Therefore, the following are methods of cold bending, especially since most technologies are not very different from the hot method.

Bending using two supports

Using two supports

The workpiece is placed between two supports in such a way that the first support holds and the second acts as a load-bearing support. When exposed to a screw or hydraulic press or jack, bending occurs beyond the second support. This method can be used to bend pipes with a diameter of up to 350 millimeters. The equipment is quite simple and can be used directly at the installation sites.

Rolling

In the ring

This method is used when you need to get a ring or spiral from a small diameter pipe. The workpiece, with the help of mechanical fasteners and a pusher, moves through rotating rollers, subsequently acquiring the necessary curvature.

Bending by rolling

In this case, the workpiece is fixed and rolled out in certain places using special balls. A similar process can occur both from the outside - wrapping, and from the inside - rolling. As a result, the pipe takes on a triangular shape with rounded edges.

Reel bending

This method has become widespread in industrial production due to its relative simplicity, low energy consumption and the yield of high-quality products. In this case, internal filling is used, most often it is a metal rope with a diameter 0.1–0.5 mm smaller than the internal diameter of the workpiece.

When a rope bends, it can leave a mark on the inner surface of the pipe, so ropes made of thin woven metal fibers of non-hard grades of metal are used. Also, when using this method, a lubricant is required between the rope and the inner surface, which is usually machine oil or anti-corrosion soap emulsion. You can bend pipes with a diameter from 10 to 425 millimeters in different planes.

Therefore, for large diameters, the cable is not used, but, if possible, is replaced with a bulk or liquid substance.

Bending by rolling

By running in

The method is that a rolling roller moves around a roller or support of the required dimensions, a workpiece is placed between them and a bend is obtained. In a similar way, you can work with pipes with a diameter of up to 150 millimeters with thick walls.

Bending using internal hydrostatic movement

In this case, a liquid is pumped into the pipe, usually water or oil, and tightly closed with plugs. Subsequently, pressure is created inside, and the workpiece becomes more pliable for mechanical bending.

Manual method

Manual pipe bending

In home construction, it is better to use special pipe benders. But it is necessary to take into account the possible undesirable consequences described above.

Note! For less lumen deformation, internal fillers should be used.

Application of bent stainless steel pipe

We also recommend that you read articles that describe methods for bending other pipes:

This video shows how you can bend a stainless pipe using a homemade pipe bender:

We bend the pipe with and without ice inside. In this video you will see the difference:

Source: https://trubyinfo.ru/kak-sognut-trubu-iz-nerzhaveyki/

How to bend a stainless steel pipe: bending stainless steel with and without a pipe bender at home

When installing a heating system made of stainless steel pipes, it becomes necessary to make bends and transitions at an angle for precise adjustment of pipeline joints. To perform this operation, a special device is used, a stainless steel pipe bender. Depending on the volume of work, the pipe bender can be in a manual version, or for industrial bending.

Technical features and properties of stainless steel pipes

Stainless steel has a whole range of remarkable useful properties and is therefore widely used in industry, medical production, public utilities and everyday life. Its main properties include the ability to withstand aggressive environments, resistance to corrosion and high temperatures, and high mechanical strength.

Bent stainless steel elements

Steel acquired such properties due to its chemical composition, the main element of which is chromium. When steel is made, other alloying additives are added to give the resulting products a nice, smooth appearance.

Important! Stainless steel has no harmful effects on the conductive environment, so it is absolutely safe for food and water.

Methods to prevent ovalization

When bending stainless pipes, especially thin-walled ones, undesirable changes in the shape and wall thickness of the product material appear, in particular:

• the external shape changes, ovalization appears;
• there is a decrease in the thickness of the outer wall due to stretching during bending;
• the appearance of folds and kinks on the inner radius of the bend;
• After bending is completed, due to the springing properties of the product, the bending radius and rotation angle increase.

All these negative consequences affect the appearance of the product; reducing the wall thickness weakens the strength. And ovalization reduces the flow area and causes additional resistance to the movement of the working medium.

Therefore, to prevent such changes, pipe bending is carried out using methods that allow maintaining the round shape of the product without deformation. One of these methods is based on using internal filling of the pipe with a rigid or elastic material to protect the internal walls from deformation.

Change of section, ovalization

Sand, crushed cork, rubber and even water can be used as filler. To prevent the filler from spilling out during bending, the pipe section is closed on both sides with a plug. To prevent external displacement of the pipe walls, external stops in the form of a roller are used.

The best effect is achieved by using a hard substance as a filler, so this method is more common. Usually, when bending, two methods of preventing deformation are used at once, internal and external; it gives the best effect.

Industrial bending methods

In industrial conditions, various methods are used to bend stainless steel pipes: using a pipe bender, the winding method, the rolling method, rolling, drawing and stretching on supports. The use of one or another method depends on the serial production, as well as on the type and size of the resulting bent final product.

Bending with a pipe bender

For small production volumes or when installing heating pipeline systems on construction sites, a manual pipe bender is used. The pipe bender is lightweight and can be easily transported to the work site. They provide a quick change of rollers of different diameters and a maximum bending angle of 180 degrees. The screw rod of the pipe bender drives the bending roller, which bends pipes up to 18 mm in diameter.

In places where there are electrical networks, a portable electric pipe bender for stainless steel is used. The delivery package includes a large set of various devices for bending various sizes of materials and bending radii. Adjustable bending speed, reverse and automatic mode, as well as low weight give this device a significant advantage over other pipe benders.

Electric pipe bender

If there is no electrical network, you can connect a battery to operate the device.

Bending by winding method

Using the coiling method, pipe bending is done on special pipe bending machines. This method is used mainly for those industries where it is necessary to obtain a high-quality profile pipe with a small bend radius and complete invariability of the wall geometry. These are the aviation and space industries, mechanical engineering and furniture production.

The bending process occurs as follows: the pipeline is put on a special device called a mandrel and attached to a bending roller using a clamp. The bending roller with the clamp rotates and pulls the pipe, which is wound onto the roller to the specified bend angle. The mandrel located inside the product retains the shape of the product, preventing its cross-section from changing.

Pipe bending machine for coil bending

Rolling

Roller pipe benders are designed for bending products into rings, arcs, and you can even bend the workpiece into a spiral, and you can set the pitch of the spiral turn. The process of bending into a ring consists of two stages:

3 roller pipe bender

1. First, a preload is created on the machine, the curvature and bend radius are set. This tension is produced by the middle movable roller when the pipe rests on two end rollers.
2. Pipe bending is carried out under the influence of friction force, which appears due to the rotation of the drive rollers and the product. The pipe rushes in the direction of rotation and bends to a given radius. If during the run it is not possible to obtain the specified radius, the operation can be repeated, with greater pressure on the movable roller.

On 3-roller pipe benders, the bend radius depends on the wall thickness. For thin-walled pipes, the bend radius is greater than -10D, for thick-walled pipes -10D, and for products with very thick walls it can be -5D.

Drawing

Sometimes it becomes necessary to bend a pipe to reduce its diameter. This method is called drawing. It is used for products with a thin wall. First, the end is crimped to the calculated diameter. The crimped end is then pulled through the die and secured with a clamp to the bending template.

Drawing bending scheme

When the template is rotated, the product is pulled through the die, while the diameter decreases and bending occurs. With this bending method, the wall thickness decreases more than with conventional bending.

Stretching

The stretch bending method is very rarely used. It consists in the fact that the ends of the product are fixed, and the middle part is acted upon with a pressure roller. In this case, the workpiece is lengthened, the walls become thinner, and bending is performed at a given angle.

Bending on supports

For bending on supports, a so-called crossbow-type pipe bender is used. The pipe is installed between two support rollers, and the force is applied in the middle by the pressure roller using a screw jack or hydraulic drive. Using such a stationary device, you can bend products with a diameter of up to 350 mm. Lightweight portable pipe benders and crossbows are also produced, which are used for pipes with a diameter of up to 100 mm.

Crossbow type pipe bender

Bending methods at home

When performing bending work at home, two methods are used: using a manual pipe bender or without using it.

Important! Having a pipe bender with the necessary supply of rollers of different diameters makes the work easier, especially since by changing the rollers you can bend products of different diameters.

The device is installed in a vice, the rollers are selected according to size and a pipe is inserted between the rollers so that its end rests against the stop. Next, use the handle to turn the movable roller to the bend angle, check the dimensions again and remove the finished product.

Manual pipe bender

Without a pipe bender, a pipe can be bent using a spring made of wire with a cross-section of no more than 4 mm. The spring is secured at the end, and the workpiece is inserted into the stop for fixation, or it can be clamped in a vice, but so as not to deform the end. Then the other end is bent according to a pre-prepared template. After bending is completed, the spring is removed from the product profile.

The choice of bending method depends on many conditions, including serial production, the quality and shape of the final product, the location of the work, and the cost of the equipment. But when bending a product, various defects, thinning of the walls, ovality and the formation of folds may occur. Therefore, all these factors must be taken into account before starting work.

Source: https://ZnatokTepla.ru/truby/metody-gibki.html

Bending using two supports

The workpiece is placed between two supports so that the first support holds, and the second is load-bearing. When a screw or hydraulic press or jack is used, the second support then bends. Using this method it is possible to bend pipes with a diameter of up to 350 millimeters. The equipment is quite simple and can be used specifically at installation sites.

Bending by rolling

In this case, the workpiece is fixed and rolled out in certain places using special balls. A similar process can occur both from the outside - wrapping, and from the inside - rolling. As a result, the pipe gets a triangular shape with rounded edges.

Bending by rolling

The method is that a rolling roller moves near a roller or support of the required dimensions, a workpiece is placed between them and a bend is obtained. Using a similar method, it is possible to work with pipes with a diameter of up to 150 millimeters with thick walls.

Bending through internal hydrostatic movement

In this case, a liquid is pumped into the pipe, in most cases it is water or oil, and it is well closed with plugs. Then pressure is created, and the workpiece is made more pliable for mechanical bending.

Manual method

In home construction, it is better to use special pipe benders. But you need to take into account the likely undesirable consequences outlined above.

Advice! For less deformation of the lumen, internal fillers should be used.

In addition, we recommend that you read articles that outline methods for bending other pipes:

• How to bend a bronze pipe.
• How to bend a polypropylene pipe.
• How to bend a metal-plastic pipe.
• How to bend a profile pipe at home.

This video demonstrates how it is possible to bend a stainless pipe using a homemade pipe bender:

We bend the pipe with and without ice. In this video you will notice the difference:

Source: https://uchebniksantehnika.ru/truby/kak-sognut-trubu-iz-nerzhaveiki.html